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Set new scheduling algorithm VATS for lock waits as a default.

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This commit is contained in:
Jan Lindström 2016-10-25 12:21:07 +03:00
parent 201c1e0f29
commit 0c15d1a6ff
2 changed files with 3 additions and 3 deletions
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4
mysql-test/suite/sys_vars/r/sysvars_innodb.result
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@ -1449,9 +1449,9 @@ READ_ONLY YES
COMMAND_LINE_ARGUMENT NONE
VARIABLE_NAME INNODB_LOCK_SCHEDULE_ALGORITHM
SESSION_VALUE NULL
GLOBAL_VALUE fcfs
GLOBAL_VALUE vats
GLOBAL_VALUE_ORIGIN COMPILE-TIME
DEFAULT_VALUE fcfs
DEFAULT_VALUE vats
VARIABLE_SCOPE GLOBAL
VARIABLE_TYPE ENUM
VARIABLE_COMMENT The algorithm Innodb uses for deciding which locks to grant next when a lock is released. Possible values are FCFS grant the locks in First-Come-First-Served order; VATS use the Variance-Aware-Transaction-Scheduling algorithm, which uses an Eldest-Transaction-First heuristic.

2
storage/innobase/handler/ha_innodb.cc
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@ -22808,7 +22808,7 @@ static MYSQL_SYSVAR_ENUM(lock_schedule_algorithm, innodb_lock_schedule_algorithm
" VATS"
" use the Variance-Aware-Transaction-Scheduling algorithm, which"
" uses an Eldest-Transaction-First heuristic.",
NULL, NULL, INNODB_LOCK_SCHEDULE_ALGORITHM_FCFS,
NULL, NULL, INNODB_LOCK_SCHEDULE_ALGORITHM_VATS,
&innodb_lock_schedule_algorithm_typelib);
static MYSQL_SYSVAR_ULONG(buffer_pool_instances, srv_buf_pool_instances,